this morning, while visiting tokyo, vice president joe biden admitted that the u.s. is, quote, deeply concerned, end quote, about china's new claim to control air space in the south china sea, an important trade route. biden will be meeting with china's president on thursday. >>> and president obama is launching a new campaign today, trying to sell the benefits of his new health care law. it comes just a day after a surge in new visitors to the healthcare.gov website. but problems with the site still remain. and a new poll finds that one-third of younger americans don't even know about the law. >>> and new details about that deadly train derailment here in new york on sunday. sources say it was likely caused by human error. the train was traveling some 82 miles per hour in a 30-mile-per-hour zone. the engineer's cell phone is now being analyzed to determine if he was, in fact, distracted at the time of the trash. drug and alcohol testing has not yet been completed, as well. >>> and a new report card shows that american teens are falling further behind in math. u.s. t